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// SPDX-License-Identifier: GPL-3.0-or-later
#include "ebpf.h"
#include "ebpf_fd.h"
static char *fd_dimension_names[NETDATA_FD_SYSCALL_END] = { "open", "close" };
static char *fd_id_names[NETDATA_FD_SYSCALL_END] = { "do_sys_open", "__close_fd" };
static netdata_syscall_stat_t fd_aggregated_data[NETDATA_FD_SYSCALL_END];
static netdata_publish_syscall_t fd_publish_aggregated[NETDATA_FD_SYSCALL_END];
static ebpf_local_maps_t fd_maps[] = {{.name = "tbl_fd_pid", .internal_input = ND_EBPF_DEFAULT_PID_SIZE,
.user_input = 0,
.type = NETDATA_EBPF_MAP_RESIZABLE | NETDATA_EBPF_MAP_PID,
.map_fd = ND_EBPF_MAP_FD_NOT_INITIALIZED},
{.name = "tbl_fd_global", .internal_input = NETDATA_KEY_END_VECTOR,
.user_input = 0, .type = NETDATA_EBPF_MAP_STATIC,
.map_fd = ND_EBPF_MAP_FD_NOT_INITIALIZED},
{.name = "fd_ctrl", .internal_input = NETDATA_CONTROLLER_END,
.user_input = 0,
.type = NETDATA_EBPF_MAP_CONTROLLER,
.map_fd = ND_EBPF_MAP_FD_NOT_INITIALIZED},
{.name = NULL, .internal_input = 0, .user_input = 0,
.type = NETDATA_EBPF_MAP_CONTROLLER,
.map_fd = ND_EBPF_MAP_FD_NOT_INITIALIZED}};
struct config fd_config = { .first_section = NULL, .last_section = NULL, .mutex = NETDATA_MUTEX_INITIALIZER,
.index = {.avl_tree = { .root = NULL, .compar = appconfig_section_compare },
.rwlock = AVL_LOCK_INITIALIZER } };
static struct bpf_link **probe_links = NULL;
static struct bpf_object *objects = NULL;
struct netdata_static_thread fd_thread = {"FD KERNEL", NULL, NULL, 1, NULL,
NULL, NULL};
static int read_thread_closed = 1;
static netdata_idx_t fd_hash_values[NETDATA_FD_COUNTER];
static netdata_idx_t *fd_values = NULL;
netdata_fd_stat_t *fd_vector = NULL;
netdata_fd_stat_t **fd_pid = NULL;
/*****************************************************************
*
* FUNCTIONS TO CLOSE THE THREAD
*
*****************************************************************/
/**
* Clean PID structures
*
* Clean the allocated structures.
*/
void clean_fd_pid_structures() {
struct pid_stat *pids = root_of_pids;
while (pids) {
freez(fd_pid[pids->pid]);
pids = pids->next;
}
}
/**
* Clean up the main thread.
*
* @param ptr thread data.
*/
static void ebpf_fd_cleanup(void *ptr)
{
ebpf_module_t *em = (ebpf_module_t *)ptr;
if (!em->enabled)
return;
heartbeat_t hb;
heartbeat_init(&hb);
uint32_t tick = 2 * USEC_PER_MS;
while (!read_thread_closed) {
usec_t dt = heartbeat_next(&hb, tick);
UNUSED(dt);
}
ebpf_cleanup_publish_syscall(fd_publish_aggregated);
freez(fd_thread.thread);
freez(fd_values);
freez(fd_vector);
if (probe_links) {
struct bpf_program *prog;
size_t i = 0 ;
bpf_object__for_each_program(prog, objects) {
bpf_link__destroy(probe_links[i]);
i++;
}
bpf_object__close(objects);
}
}
/*****************************************************************
*
* MAIN LOOP
*
*****************************************************************/
/**
* Send data to Netdata calling auxiliar functions.
*
* @param em the structure with thread information
*/
static void ebpf_fd_send_data(ebpf_module_t *em)
{
fd_publish_aggregated[NETDATA_FD_SYSCALL_OPEN].ncall = fd_hash_values[NETDATA_KEY_CALLS_DO_SYS_OPEN];
fd_publish_aggregated[NETDATA_FD_SYSCALL_OPEN].nerr = fd_hash_values[NETDATA_KEY_ERROR_DO_SYS_OPEN];
fd_publish_aggregated[NETDATA_FD_SYSCALL_CLOSE].ncall = fd_hash_values[NETDATA_KEY_CALLS_CLOSE_FD];
fd_publish_aggregated[NETDATA_FD_SYSCALL_CLOSE].nerr = fd_hash_values[NETDATA_KEY_ERROR_CLOSE_FD];
write_count_chart(NETDATA_FILE_OPEN_CLOSE_COUNT, NETDATA_FILESYSTEM_FAMILY, fd_publish_aggregated,
NETDATA_FD_SYSCALL_END);
if (em->mode < MODE_ENTRY) {
write_err_chart(NETDATA_FILE_OPEN_ERR_COUNT, NETDATA_FILESYSTEM_FAMILY,
fd_publish_aggregated, NETDATA_FD_SYSCALL_END);
}
}
/**
* Read global counter
*
* Read the table with number of calls for all functions
*/
static void read_global_table()
{
uint32_t idx;
netdata_idx_t *val = fd_hash_values;
netdata_idx_t *stored = fd_values;
int fd = fd_maps[NETDATA_FD_GLOBAL_STATS].map_fd;
for (idx = NETDATA_KEY_CALLS_DO_SYS_OPEN; idx < NETDATA_FD_COUNTER; idx++) {
if (!bpf_map_lookup_elem(fd, &idx, stored)) {
int i;
int end = ebpf_nprocs;
netdata_idx_t total = 0;
for (i = 0; i < end; i++)
total += stored[i];
val[idx] = total;
}
}
}
/**
* File descriptor read hash
*
* This is the thread callback.
* This thread is necessary, because we cannot freeze the whole plugin to read the data.
*
* @param ptr It is a NULL value for this thread.
*
* @return It always returns NULL.
*/
void *ebpf_fd_read_hash(void *ptr)
{
read_thread_closed = 0;
heartbeat_t hb;
heartbeat_init(&hb);
ebpf_module_t *em = (ebpf_module_t *)ptr;
usec_t step = NETDATA_FD_SLEEP_MS * em->update_every;
while (!close_ebpf_plugin) {
usec_t dt = heartbeat_next(&hb, step);
(void)dt;
read_global_table();
}
read_thread_closed = 1;
return NULL;
}
/**
* Apps Accumulator
*
* Sum all values read from kernel and store in the first address.
*
* @param out the vector with read values.
*/
static void fd_apps_accumulator(netdata_fd_stat_t *out)
{
int i, end = (running_on_kernel >= NETDATA_KERNEL_V4_15) ? ebpf_nprocs : 1;
netdata_fd_stat_t *total = &out[0];
for (i = 1; i < end; i++) {
netdata_fd_stat_t *w = &out[i];
total->open_call += w->open_call;
total->close_call += w->close_call;
total->open_err += w->open_err;
total->close_err += w->close_err;
}
}
/**
* Fill PID
*
* Fill PID structures
*
* @param current_pid pid that we are collecting data
* @param out values read from hash tables;
*/
static void fd_fill_pid(uint32_t current_pid, netdata_fd_stat_t *publish)
{
netdata_fd_stat_t *curr = fd_pid[current_pid];
if (!curr) {
curr = callocz(1, sizeof(netdata_fd_stat_t));
fd_pid[current_pid] = curr;
}
memcpy(curr, &publish[0], sizeof(netdata_fd_stat_t));
}
/**
* Read APPS table
*
* Read the apps table and store data inside the structure.
*/
static void read_apps_table()
{
netdata_fd_stat_t *fv = fd_vector;
uint32_t key;
struct pid_stat *pids = root_of_pids;
int fd = fd_maps[NETDATA_FD_PID_STATS].map_fd;
size_t length = sizeof(netdata_fd_stat_t) * ebpf_nprocs;
while (pids) {
key = pids->pid;
if (bpf_map_lookup_elem(fd, &key, fv)) {
pids = pids->next;
continue;
}
fd_apps_accumulator(fv);
fd_fill_pid(key, fv);
// We are cleaning to avoid passing data read from one process to other.
memset(fv, 0, length);
pids = pids->next;
}
}
/**
* Update cgroup
*
* Update cgroup data based in
*/
static void ebpf_update_fd_cgroup()
{
ebpf_cgroup_target_t *ect ;
netdata_fd_stat_t *fv = fd_vector;
int fd = fd_maps[NETDATA_FD_PID_STATS].map_fd;
size_t length = sizeof(netdata_fd_stat_t) * ebpf_nprocs;
pthread_mutex_lock(&mutex_cgroup_shm);
for (ect = ebpf_cgroup_pids; ect; ect = ect->next) {
struct pid_on_target2 *pids;
for (pids = ect->pids; pids; pids = pids->next) {
int pid = pids->pid;
netdata_fd_stat_t *out = &pids->fd;
if (likely(fd_pid) && fd_pid[pid]) {
netdata_fd_stat_t *in = fd_pid[pid];
memcpy(out, in, sizeof(netdata_fd_stat_t));
} else {
memset(fv, 0, length);
if (!bpf_map_lookup_elem(fd, &pid, fv)) {
fd_apps_accumulator(fv);
memcpy(out, fv, sizeof(netdata_fd_stat_t));
}
}
}
}
pthread_mutex_unlock(&mutex_cgroup_shm);
}
/**
* Sum PIDs
*
* Sum values for all targets.
*
* @param fd the output
* @param root list of pids
*/
static void ebpf_fd_sum_pids(netdata_fd_stat_t *fd, struct pid_on_target *root)
{
uint32_t open_call = 0;
uint32_t close_call = 0;
uint32_t open_err = 0;
uint32_t close_err = 0;
while (root) {
int32_t pid = root->pid;
netdata_fd_stat_t *w = fd_pid[pid];
if (w) {
open_call += w->open_call;
close_call += w->close_call;
open_err += w->open_err;
close_err += w->close_err;
}
root = root->next;
}
// These conditions were added, because we are using incremental algorithm
fd->open_call = (open_call >= fd->open_call) ? open_call : fd->open_call;
fd->close_call = (close_call >= fd->close_call) ? close_call : fd->close_call;
fd->open_err = (open_err >= fd->open_err) ? open_err : fd->open_err;
fd->close_err = (close_err >= fd->close_err) ? close_err : fd->close_err;
}
/**
* Send data to Netdata calling auxiliar functions.
*
* @param em the structure with thread information
* @param root the target list.
*/
void ebpf_fd_send_apps_data(ebpf_module_t *em, struct target *root)
{
struct target *w;
for (w = root; w; w = w->next) {
if (unlikely(w->exposed && w->processes)) {
ebpf_fd_sum_pids(&w->fd, w->root_pid);
}
}
write_begin_chart(NETDATA_APPS_FAMILY, NETDATA_SYSCALL_APPS_FILE_OPEN);
for (w = root; w; w = w->next) {
if (unlikely(w->exposed && w->processes)) {
write_chart_dimension(w->name, w->fd.open_call);
}
}
write_end_chart();
if (em->mode < MODE_ENTRY) {
write_begin_chart(NETDATA_APPS_FAMILY, NETDATA_SYSCALL_APPS_FILE_OPEN_ERROR);
for (w = root; w; w = w->next) {
if (unlikely(w->exposed && w->processes)) {
write_chart_dimension(w->name, w->fd.open_err);
}
}
write_end_chart();
}
write_begin_chart(NETDATA_APPS_FAMILY, NETDATA_SYSCALL_APPS_FILE_CLOSED);
for (w = root; w; w = w->next) {
if (unlikely(w->exposed && w->processes)) {
write_chart_dimension(w->name, w->fd.close_call);
}
}
write_end_chart();
if (em->mode < MODE_ENTRY) {
write_begin_chart(NETDATA_APPS_FAMILY, NETDATA_SYSCALL_APPS_FILE_CLOSE_ERROR);
for (w = root; w; w = w->next) {
if (unlikely(w->exposed && w->processes)) {
write_chart_dimension(w->name, w->fd.close_err);
}
}
write_end_chart();
}
}
/**
* Sum PIDs
*
* Sum values for all targets.
*
* @param fd structure used to store data
* @param pids input data
*/
static void ebpf_fd_sum_cgroup_pids(netdata_fd_stat_t *fd, struct pid_on_target2 *pids)
{
netdata_fd_stat_t accumulator;
memset(&accumulator, 0, sizeof(accumulator));
while (pids) {
netdata_fd_stat_t *w = &pids->fd;
accumulator.open_err += w->open_err;
accumulator.open_call += w->open_call;
accumulator.close_call += w->close_call;
accumulator.close_err += w->close_err;
pids = pids->next;
}
fd->open_call = (accumulator.open_call >= fd->open_call) ? accumulator.open_call : fd->open_call;
fd->open_err = (accumulator.open_err >= fd->open_err) ? accumulator.open_err : fd->open_err;
fd->close_call = (accumulator.close_call >= fd->close_call) ? accumulator.close_call : fd->close_call;
fd->close_err = (accumulator.close_err >= fd->close_err) ? accumulator.close_err : fd->close_err;
}
/**
* Create specific file descriptor charts
*
* Create charts for cgroup/application.
*
* @param type the chart type.
* @param em the main thread structure.
*/
static void ebpf_create_specific_fd_charts(char *type, ebpf_module_t *em)
{
ebpf_create_chart(type, NETDATA_SYSCALL_APPS_FILE_OPEN, "Number of open files",
EBPF_COMMON_DIMENSION_CALL, NETDATA_APPS_FILE_CGROUP_GROUP,
NETDATA_CGROUP_FD_OPEN_CONTEXT, NETDATA_EBPF_CHART_TYPE_LINE,
NETDATA_CHART_PRIO_CGROUPS_CONTAINERS + 5400,
ebpf_create_global_dimension,
&fd_publish_aggregated[NETDATA_FD_SYSCALL_OPEN],
1, em->update_every, NETDATA_EBPF_MODULE_NAME_SWAP);
if (em->mode < MODE_ENTRY) {
ebpf_create_chart(type, NETDATA_SYSCALL_APPS_FILE_OPEN_ERROR, "Fails to open files",
EBPF_COMMON_DIMENSION_CALL, NETDATA_APPS_FILE_CGROUP_GROUP,
NETDATA_CGROUP_FD_OPEN_ERR_CONTEXT, NETDATA_EBPF_CHART_TYPE_LINE,
NETDATA_CHART_PRIO_CGROUPS_CONTAINERS + 5401,
ebpf_create_global_dimension,
&fd_publish_aggregated[NETDATA_FD_SYSCALL_OPEN],
1, em->update_every,
NETDATA_EBPF_MODULE_NAME_SWAP);
}
ebpf_create_chart(type, NETDATA_SYSCALL_APPS_FILE_CLOSED, "Files closed",
EBPF_COMMON_DIMENSION_CALL, NETDATA_APPS_FILE_CGROUP_GROUP,
NETDATA_CGROUP_FD_CLOSE_CONTEXT, NETDATA_EBPF_CHART_TYPE_LINE,
NETDATA_CHART_PRIO_CGROUPS_CONTAINERS + 5402,
ebpf_create_global_dimension,
&fd_publish_aggregated[NETDATA_FD_SYSCALL_CLOSE],
1, em->update_every, NETDATA_EBPF_MODULE_NAME_SWAP);
if (em->mode < MODE_ENTRY) {
ebpf_create_chart(type, NETDATA_SYSCALL_APPS_FILE_CLOSE_ERROR, "Fails to close files",
EBPF_COMMON_DIMENSION_CALL, NETDATA_APPS_FILE_CGROUP_GROUP,
NETDATA_CGROUP_FD_CLOSE_ERR_CONTEXT, NETDATA_EBPF_CHART_TYPE_LINE,
NETDATA_CHART_PRIO_CGROUPS_CONTAINERS + 5403,
ebpf_create_global_dimension,
&fd_publish_aggregated[NETDATA_FD_SYSCALL_CLOSE],
1, em->update_every,
NETDATA_EBPF_MODULE_NAME_SWAP);
}
}
/**
* Obsolete specific file descriptor charts
*
* Obsolete charts for cgroup/application.
*
* @param type the chart type.
* @param em the main thread structure.
*/
static void ebpf_obsolete_specific_fd_charts(char *type, ebpf_module_t *em)
{
ebpf_write_chart_obsolete(type, NETDATA_SYSCALL_APPS_FILE_OPEN, "Number of open files",
EBPF_COMMON_DIMENSION_CALL, NETDATA_APPS_FILE_GROUP,
NETDATA_EBPF_CHART_TYPE_LINE, NETDATA_CGROUP_FD_OPEN_CONTEXT,
NETDATA_CHART_PRIO_CGROUPS_CONTAINERS + 5400, em->update_every);
if (em->mode < MODE_ENTRY) {
ebpf_write_chart_obsolete(type, NETDATA_SYSCALL_APPS_FILE_OPEN_ERROR, "Fails to open files",
EBPF_COMMON_DIMENSION_CALL, NETDATA_APPS_FILE_GROUP,
NETDATA_EBPF_CHART_TYPE_LINE, NETDATA_CGROUP_FD_OPEN_ERR_CONTEXT,
NETDATA_CHART_PRIO_CGROUPS_CONTAINERS + 5401, em->update_every);
}
ebpf_write_chart_obsolete(type, NETDATA_SYSCALL_APPS_FILE_CLOSED, "Files closed",
EBPF_COMMON_DIMENSION_CALL, NETDATA_APPS_FILE_GROUP,
NETDATA_EBPF_CHART_TYPE_LINE, NETDATA_CGROUP_FD_CLOSE_CONTEXT,
NETDATA_CHART_PRIO_CGROUPS_CONTAINERS + 5402, em->update_every);
if (em->mode < MODE_ENTRY) {
ebpf_write_chart_obsolete(type, NETDATA_SYSCALL_APPS_FILE_CLOSE_ERROR, "Fails to close files",
EBPF_COMMON_DIMENSION_CALL, NETDATA_APPS_FILE_GROUP,
NETDATA_EBPF_CHART_TYPE_LINE, NETDATA_CGROUP_FD_CLOSE_ERR_CONTEXT,
NETDATA_CHART_PRIO_CGROUPS_CONTAINERS + 5403, em->update_every);
}
}
/*
* Send specific file descriptor data
*
* Send data for specific cgroup/apps.
*
* @param type chart type
* @param values structure with values that will be sent to netdata
*/
static void ebpf_send_specific_fd_data(char *type, netdata_fd_stat_t *values, ebpf_module_t *em)
{
write_begin_chart(type, NETDATA_SYSCALL_APPS_FILE_OPEN);
write_chart_dimension(fd_publish_aggregated[NETDATA_FD_SYSCALL_OPEN].name, (long long)values->open_call);
write_end_chart();
if (em->mode < MODE_ENTRY) {
write_begin_chart(type, NETDATA_SYSCALL_APPS_FILE_OPEN_ERROR);
write_chart_dimension(fd_publish_aggregated[NETDATA_FD_SYSCALL_OPEN].name, (long long)values->open_err);
write_end_chart();
}
write_begin_chart(type, NETDATA_SYSCALL_APPS_FILE_CLOSED);
write_chart_dimension(fd_publish_aggregated[NETDATA_FD_SYSCALL_CLOSE].name, (long long)values->close_call);
write_end_chart();
if (em->mode < MODE_ENTRY) {
write_begin_chart(type, NETDATA_SYSCALL_APPS_FILE_CLOSE_ERROR);
write_chart_dimension(fd_publish_aggregated[NETDATA_FD_SYSCALL_CLOSE].name, (long long)values->close_err);
write_end_chart();
}
}
/**
* Create systemd file descriptor charts
*
* Create charts when systemd is enabled
*
* @param em the main collector structure
**/
static void ebpf_create_systemd_fd_charts(ebpf_module_t *em)
{
ebpf_create_charts_on_systemd(NETDATA_SYSCALL_APPS_FILE_OPEN, "Number of open files",
EBPF_COMMON_DIMENSION_CALL, NETDATA_APPS_FILE_CGROUP_GROUP,
NETDATA_EBPF_CHART_TYPE_STACKED, 20061,
ebpf_algorithms[NETDATA_EBPF_INCREMENTAL_IDX], NETDATA_SYSTEMD_FD_OPEN_CONTEXT,
NETDATA_EBPF_MODULE_NAME_PROCESS, em->update_every);
if (em->mode < MODE_ENTRY) {
ebpf_create_charts_on_systemd(NETDATA_SYSCALL_APPS_FILE_OPEN_ERROR, "Fails to open files",
EBPF_COMMON_DIMENSION_CALL, NETDATA_APPS_FILE_CGROUP_GROUP,
NETDATA_EBPF_CHART_TYPE_STACKED, 20062,
ebpf_algorithms[NETDATA_EBPF_INCREMENTAL_IDX], NETDATA_SYSTEMD_FD_OPEN_ERR_CONTEXT,
NETDATA_EBPF_MODULE_NAME_PROCESS, em->update_every);
}
ebpf_create_charts_on_systemd(NETDATA_SYSCALL_APPS_FILE_CLOSED, "Files closed",
EBPF_COMMON_DIMENSION_CALL, NETDATA_APPS_FILE_CGROUP_GROUP,
NETDATA_EBPF_CHART_TYPE_STACKED, 20063,
ebpf_algorithms[NETDATA_EBPF_INCREMENTAL_IDX], NETDATA_SYSTEMD_FD_CLOSE_CONTEXT,
NETDATA_EBPF_MODULE_NAME_PROCESS, em->update_every);
if (em->mode < MODE_ENTRY) {
ebpf_create_charts_on_systemd(NETDATA_SYSCALL_APPS_FILE_CLOSE_ERROR, "Fails to close files",
EBPF_COMMON_DIMENSION_CALL, NETDATA_APPS_FILE_CGROUP_GROUP,
NETDATA_EBPF_CHART_TYPE_STACKED, 20064,
ebpf_algorithms[NETDATA_EBPF_INCREMENTAL_IDX], NETDATA_SYSTEMD_FD_CLOSE_ERR_CONTEXT,
NETDATA_EBPF_MODULE_NAME_PROCESS, em->update_every);
}
}
/**
* Send Systemd charts
*
* Send collected data to Netdata.
*
* @param em the main collector structure
*
* @return It returns the status for chart creation, if it is necessary to remove a specific dimension zero is returned
* otherwise function returns 1 to avoid chart recreation
*/
static int ebpf_send_systemd_fd_charts(ebpf_module_t *em)
{
int ret = 1;
ebpf_cgroup_target_t *ect;
write_begin_chart(NETDATA_SERVICE_FAMILY, NETDATA_SYSCALL_APPS_FILE_OPEN);
for (ect = ebpf_cgroup_pids; ect ; ect = ect->next) {
if (unlikely(ect->systemd) && unlikely(ect->updated)) {
write_chart_dimension(ect->name, ect->publish_systemd_fd.open_call);
} else
ret = 0;
}
write_end_chart();
if (em->mode < MODE_ENTRY) {
write_begin_chart(NETDATA_SERVICE_FAMILY, NETDATA_SYSCALL_APPS_FILE_OPEN_ERROR);
for (ect = ebpf_cgroup_pids; ect ; ect = ect->next) {
if (unlikely(ect->systemd) && unlikely(ect->updated)) {
write_chart_dimension(ect->name, ect->publish_systemd_fd.open_err);
}
}
write_end_chart();
}
write_begin_chart(NETDATA_SERVICE_FAMILY, NETDATA_SYSCALL_APPS_FILE_CLOSED);
for (ect = ebpf_cgroup_pids; ect ; ect = ect->next) {
if (unlikely(ect->systemd) && unlikely(ect->updated)) {
write_chart_dimension(ect->name, ect->publish_systemd_fd.close_call);
}
}
write_end_chart();
if (em->mode < MODE_ENTRY) {
write_begin_chart(NETDATA_SERVICE_FAMILY, NETDATA_SYSCALL_APPS_FILE_CLOSE_ERROR);
for (ect = ebpf_cgroup_pids; ect ; ect = ect->next) {
if (unlikely(ect->systemd) && unlikely(ect->updated)) {
write_chart_dimension(ect->name, ect->publish_systemd_fd.close_err);
}
}
write_end_chart();
}
return ret;
}
/**
* Send data to Netdata calling auxiliar functions.
*
* @param em the main collector structure
*/
static void ebpf_fd_send_cgroup_data(ebpf_module_t *em)
{
if (!ebpf_cgroup_pids)
return;
pthread_mutex_lock(&mutex_cgroup_shm);
ebpf_cgroup_target_t *ect;
for (ect = ebpf_cgroup_pids; ect ; ect = ect->next) {
ebpf_fd_sum_cgroup_pids(&ect->publish_systemd_fd, ect->pids);
}
int has_systemd = shm_ebpf_cgroup.header->systemd_enabled;
if (has_systemd) {
static int systemd_charts = 0;
if (!systemd_charts) {
ebpf_create_systemd_fd_charts(em);
systemd_charts = 1;
}
systemd_charts = ebpf_send_systemd_fd_charts(em);
}
for (ect = ebpf_cgroup_pids; ect ; ect = ect->next) {
if (ect->systemd)
continue;
if (!(ect->flags & NETDATA_EBPF_CGROUP_HAS_FD_CHART) && ect->updated) {
ebpf_create_specific_fd_charts(ect->name, em);
ect->flags |= NETDATA_EBPF_CGROUP_HAS_FD_CHART;
}
if (ect->flags & NETDATA_EBPF_CGROUP_HAS_FD_CHART ) {
if (ect->updated) {
ebpf_send_specific_fd_data(ect->name, &ect->publish_systemd_fd, em);
} else {
ebpf_obsolete_specific_fd_charts(ect->name, em);
ect->flags &= ~NETDATA_EBPF_CGROUP_HAS_FD_CHART;
}
}
}
pthread_mutex_unlock(&mutex_cgroup_shm);
}
/**
* Main loop for this collector.
*/
static void fd_collector(ebpf_module_t *em)
{
fd_thread.thread = mallocz(sizeof(netdata_thread_t));
fd_thread.start_routine = ebpf_fd_read_hash;
netdata_thread_create(fd_thread.thread, fd_thread.name, NETDATA_THREAD_OPTION_JOINABLE,
ebpf_fd_read_hash, em);
int apps = em->apps_charts;
int cgroups = em->cgroup_charts;
int update_every = em->update_every;
int counter = update_every - 1;
while (!close_ebpf_plugin) {
pthread_mutex_lock(&collect_data_mutex);
pthread_cond_wait(&collect_data_cond_var, &collect_data_mutex);
if (++counter == update_every) {
counter = 0;
if (apps)
read_apps_table();
if (cgroups)
ebpf_update_fd_cgroup();
pthread_mutex_lock(&lock);
ebpf_fd_send_data(em);
if (apps)
ebpf_fd_send_apps_data(em, apps_groups_root_target);
if (cgroups)
ebpf_fd_send_cgroup_data(em);
pthread_mutex_unlock(&lock);
}
pthread_mutex_unlock(&collect_data_mutex);
}
}
/*****************************************************************
*
* CREATE CHARTS
*
*****************************************************************/
/**
* Create apps charts
*
* Call ebpf_create_chart to create the charts on apps submenu.
*
* @param em a pointer to the structure with the default values.
*/
void ebpf_fd_create_apps_charts(struct ebpf_module *em, void *ptr)
{
struct target *root = ptr;
ebpf_create_charts_on_apps(NETDATA_SYSCALL_APPS_FILE_OPEN,
"Number of open files",
EBPF_COMMON_DIMENSION_CALL,
NETDATA_APPS_FILE_GROUP,
NETDATA_EBPF_CHART_TYPE_STACKED,
20061,
ebpf_algorithms[NETDATA_EBPF_INCREMENTAL_IDX],
root, em->update_every, NETDATA_EBPF_MODULE_NAME_PROCESS);
if (em->mode < MODE_ENTRY) {
ebpf_create_charts_on_apps(NETDATA_SYSCALL_APPS_FILE_OPEN_ERROR,
"Fails to open files",
EBPF_COMMON_DIMENSION_CALL,
NETDATA_APPS_FILE_GROUP,
NETDATA_EBPF_CHART_TYPE_STACKED,
20062,
ebpf_algorithms[NETDATA_EBPF_INCREMENTAL_IDX],
root, em->update_every, NETDATA_EBPF_MODULE_NAME_PROCESS);
}
ebpf_create_charts_on_apps(NETDATA_SYSCALL_APPS_FILE_CLOSED,
"Files closed",
EBPF_COMMON_DIMENSION_CALL,
NETDATA_APPS_FILE_GROUP,
NETDATA_EBPF_CHART_TYPE_STACKED,
20063,
ebpf_algorithms[NETDATA_EBPF_INCREMENTAL_IDX],
root, em->update_every, NETDATA_EBPF_MODULE_NAME_PROCESS);
if (em->mode < MODE_ENTRY) {
ebpf_create_charts_on_apps(NETDATA_SYSCALL_APPS_FILE_CLOSE_ERROR,
"Fails to close files",
EBPF_COMMON_DIMENSION_CALL,
NETDATA_APPS_FILE_GROUP,
NETDATA_EBPF_CHART_TYPE_STACKED,
20064,
ebpf_algorithms[NETDATA_EBPF_INCREMENTAL_IDX],
root, em->update_every, NETDATA_EBPF_MODULE_NAME_PROCESS);
}
}
/**
* Create global charts
*
* Call ebpf_create_chart to create the charts for the collector.
*
* @param em a pointer to the structure with the default values.
*/
static void ebpf_create_fd_global_charts(ebpf_module_t *em)
{
ebpf_create_chart(NETDATA_FILESYSTEM_FAMILY,
NETDATA_FILE_OPEN_CLOSE_COUNT,
"Open and close calls",
EBPF_COMMON_DIMENSION_CALL,
NETDATA_FILE_GROUP,
NULL,
NETDATA_EBPF_CHART_TYPE_LINE,
NETDATA_CHART_PRIO_EBPF_FD_CHARTS,
ebpf_create_global_dimension,
fd_publish_aggregated,
NETDATA_FD_SYSCALL_END,
em->update_every, NETDATA_EBPF_MODULE_NAME_FD);
if (em->mode < MODE_ENTRY) {
ebpf_create_chart(NETDATA_FILESYSTEM_FAMILY,
NETDATA_FILE_OPEN_ERR_COUNT,
"Open fails",
EBPF_COMMON_DIMENSION_CALL,
NETDATA_FILE_GROUP,
NULL,
NETDATA_EBPF_CHART_TYPE_LINE,
NETDATA_CHART_PRIO_EBPF_FD_CHARTS + 1,
ebpf_create_global_dimension,
fd_publish_aggregated,
NETDATA_FD_SYSCALL_END,
em->update_every, NETDATA_EBPF_MODULE_NAME_FD);
}
}
/*****************************************************************
*
* MAIN THREAD
*
*****************************************************************/
/**
* Allocate vectors used with this thread.
*
* We are not testing the return, because callocz does this and shutdown the software
* case it was not possible to allocate.
*
* @param apps is apps enabled?
*/
static void ebpf_fd_allocate_global_vectors(int apps)
{
if (apps)
fd_pid = callocz((size_t)pid_max, sizeof(netdata_fd_stat_t *));
fd_vector = callocz((size_t)ebpf_nprocs, sizeof(netdata_fd_stat_t));
fd_values = callocz((size_t)ebpf_nprocs, sizeof(netdata_idx_t));
}
/**
* Directory Cache thread
*
* Thread used to make dcstat thread
*
* @param ptr a pointer to `struct ebpf_module`
*
* @return It always returns NULL
*/
void *ebpf_fd_thread(void *ptr)
{
netdata_thread_cleanup_push(ebpf_fd_cleanup, ptr);
ebpf_module_t *em = (ebpf_module_t *)ptr;
em->maps = fd_maps;
if (!em->enabled)
goto endfd;
ebpf_fd_allocate_global_vectors(em->apps_charts);
probe_links = ebpf_load_program(ebpf_plugin_dir, em, kernel_string, &objects);
if (!probe_links) {
goto endfd;
}
int algorithms[NETDATA_FD_SYSCALL_END] = {
NETDATA_EBPF_INCREMENTAL_IDX, NETDATA_EBPF_INCREMENTAL_IDX
};
ebpf_global_labels(fd_aggregated_data, fd_publish_aggregated, fd_dimension_names, fd_id_names,
algorithms, NETDATA_FD_SYSCALL_END);
pthread_mutex_lock(&lock);
ebpf_create_fd_global_charts(em);
pthread_mutex_unlock(&lock);
fd_collector(em);
endfd:
netdata_thread_cleanup_pop(1);
return NULL;
}
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